linux-kernel - Re: [PATCH 2/2] sched/wait: avoid abort_exclusive_wait() in __wait_on_bit

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Message-ID: <20160902132045.GG10153@twins.programming.kicks-ass.net>
Date:   Fri, 2 Sep 2016 15:20:45 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>, Al Viro <viro@...IV.linux.org.uk>,
        Bart Van Assche <bvanassche@....org>,
        Johannes Weiner <hannes@...xchg.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] sched/wait: avoid abort_exclusive_wait() in
 __wait_on_bit_lock()

On Fri, Sep 02, 2016 at 02:06:43PM +0200, Oleg Nesterov wrote:

> Yes, I considered this option, but to me the addtional finish_wait()
> looks simpler.

its all relative, this stuff always makes my head hurt one way or the
other ;-)

> And, if you agree with this change I will try to change __wait_event()
> as well and kill abort_exclusive_wait().

Yeah, I think this'll work. Please send a new series with 'enhanced'
changelog so that when we have to look at this again in a few
weeks/months time we won't be cursing at ourselves for how the heck it
was supposed to work.